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Old 13 October 2011, 16:10   #31
Louise's Avatar
Country: UK - England
Town: Reading
Make: None
Length: under 3m
Join Date: Jul 2003
Posts: 2,039
Oooo, is it really exactly a year?! How spooky! Life just gets in the way sometimes!

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Old 13 October 2011, 17:36   #32
Country: UK - England
Town: Surrey
Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
Join Date: Jun 2008
Posts: 681
The engine box is huge, but For what I intend to use it for, it is not a problem. I did look at making a box that just covered the engine and would allow access to the stern down each side, but the engine is designed to sit slightly pissed which actualyl makes it quite wide, not leaving a sensible walkway down the side. I want to have storage at the rear and will be mounting a sampson post on the front of the bulkhead (suitably re enforced) which will give me a clean 180 degree sweep over the top of the engine cover with a stainless frame at the edges for the rope to slide over. The entire engine lid will be covered in foam rubber and will be an area to put a dinghy across or a Moth etc. It will also be a film platform to work from. I will not be using an A frame at the rear, everything will be kept as low as possible.
I will run a frame over the front bulkhead for nav lights, aerials and flags etc.

The BMW is an exquisite engine with no fat on it at all. It is probably physically smaller than the 4 cylinder Yanmar it is replacing and will be lighter even though it has 2 extra pistons for the same cc's. It also has another 50 HP.

I am considering using a conventional radiator and cooling fans to cool the engine and intercooler, rather than using a sea water / heat exchanger system. It will spend quite a bit of time in shallows and we get quite a lot of seaweed in Chi Harbour. Blockages are a common problem with several engines getting cooked when the seawater system gets blocked with seaweed. I have successfully cooled off road vehicles with similar power and a radiator in the rear with little airflow, I don't see why I can't do the same on the RIB?

In the pictures you will notice I have made the bottom of the keel into a second fuel tank. It has been totally re glassed and gelcoated (not shown) with a lid sealed on and another layer of class still to be applied. The hull is at its deepest where the bow stops approx 1/3 rd of the way back from the front. My plan is to use the bottom tank as extra fuel and ballast to trim the ride using a transfer pump to move the fuel from top to bottom and back. This system will give me a approx 270 litres of fuel. I don't know whether this will work, only one way to find out.

I am building it when I have time and spare cash and hope to finish it in time for the spring.
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Old 14 October 2011, 00:02   #33
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
Thanks for the pictures

Not sure about air cooling a diesel that large. Its going to take alot of air for combustion, maybe you can suck that air across the radiator? Although hot air is a bit less dense than cool and she might run a bit rich that way. I don't really know electronic ignition diesels, the electronics will probably compensate.

Alternatively you can get intake seachests with marcerator pumps at the screen to chew up detritus. I think Jabsco makes one.
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Old 17 October 2011, 04:01   #34
MarkM's Avatar
Country: Netherlands
Town: Breda
Make: Scorpion
Length: 7m +
Engine: Evinrude 250 DI
Join Date: Oct 2003
Posts: 368
Originally Posted by Louise View Post
A lovely guy from the Netherlands (I think he posted on here as MarkM but haven't seen anything from him for a while) has/had a Scorpion with a closed bow. I think he modified it himself. I think he did use it for sleeping in. I'll see if I can find a piccie to post.
Hello Louise how are you and the family? Do you still own Blue Ice?
No I didn't make the closed bow myself, was specially made by Scorpion.
Yes we sleep in the Scorpion and make many long journeys with her.
Did many modifications to the RIB since we met in 2005. New engine, powerlift, new instruments, etc.

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